A sample of 47 Vietnam veterans with the diagnosis of combat-related Post-Traumatic Stress Disorder (PTSD) was administered the MMPI and MMPI-2. Pairwise comparisons were performed on the clinical scales, Harris Lingoes subscales, and scales relevant to the assessment of PTSD. Correlational analyses were performed as well. Hit rates of high-point pairs were compared across the tests. The results suggest a high degree of congruence between tests. Differences were seen on evaluations of some scales between tests that may influence interpretation and treatment.
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Albrecht et al. (1994) studied this question.
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